{"answers":{"affected":"1 open source package ship an affected version, including book-collect.","exploited":"There is no known exploitation of MAL-2026-13027 in the wild and no public exploit code.","fix":"Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.","what":"MAL-2026-13027 is a malicious package in book-collect, published on 5 Aug 2026."},"fix_prompt":"MAL-2026-13027 is a malicious package: book-collect (npm). Every version was published to cause harm.\n\nTask:\n1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.\n2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.\n3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.\n4. If the package is not used anywhere, say so and change nothing.\n\nReference: https://insights.sbomify.com/MAL-2026-13027/ (Markdown: https://insights.sbomify.com/MAL-2026-13027/index.md)","id":"MAL-2026-13027","markdown":"https://insights.sbomify.com/MAL-2026-13027/index.md","name":"MAL-2026-13027","record":{"aliases":[],"analysis":null,"analysis_generated_by":null,"assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"On require('book-collect'), index.js loads _loader.js which downloads a platform-specific binary from Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS-TXT base64 fallback to sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru. Hostnames are reconstructed at runtime via split-array.join(\"\") and function names are built by concatenation ('child_'+'process', 'chmod'+'Sync') to evade static analysis. The fetched bytes are written to /var/tmp/.cache_\u003crand\u003e or %TEMP%\\dotnet_diag_\u003crand\u003e.exe (disguised as a dotnet diagnostic tool), chmod 0755, and spawned detached via '/bin/sh -c \u003cpath\u003e \u0026' or 'cmd.exe /c start /b'. No hash or signature verification is performed. A second copy of the same drop-write-chmod-exec chain lives in lib/telemetry.js under an 'Analytics SDK' cover story, with an env-var opt-out (DISABLE_TELEMETRY / ANALYTICS_OPT_OUT) that does not change the default install behavior.","ecosystems":["npm"],"exploits":{"exploitdb":null,"first_seen":null,"github_poc":null,"max_poc_stars":null,"metasploit":null,"nuclei":null,"refs":[],"tier":null},"has_fix":false,"headline":"Malicious code in book-collect (npm)","id":"MAL-2026-13027","indexable":true,"kev":null,"kind":"malicious","links":{"ecosystem":"npm","product":null,"products":[],"type":null,"year":"2026"},"n_packages":1,"n_references":null,"packages":[{"ecosystem":"npm","fixed":[],"introduced":[],"last_affected":[],"package":"book-collect","purl":"pkg:npm/book-collect","source":"MAL-2026-13027"}],"products":null,"published":"2026-08-05","related":[],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"OpenSSF Malicious Packages","prefix":"MAL"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":null,"updated":null,"vendors":null},"summary":null,"url":"https://insights.sbomify.com/MAL-2026-13027/"}